/*
* linux/arch/i386/kernel/mca.c
* Written by Martin Kolinek, February 1996
*
* Changes:
*
* Chris Beauregard July 28th, 1996
* - Fixed up integrated SCSI detection
*
* Chris Beauregard August 3rd, 1996
* - Made mca_info local
* - Made integrated registers accessible through standard function calls
* - Added name field
* - More sanity checking
*
* Chris Beauregard August 9th, 1996
* - Rewrote /proc/mca
*
* Chris Beauregard January 7th, 1997
* - Added basic NMI-processing
* - Added more information to mca_info structure
*
* David Weinehall October 12th, 1998
* - Made a lot of cleaning up in the source
* - Added use of save_flags / restore_flags
* - Added the 'driver_loaded' flag in MCA_adapter
* - Added an alternative implemention of ZP Gu's mca_find_unused_adapter
*
* David Weinehall March 24th, 1999
* - Fixed the output of 'Driver Installed' in /proc/mca/pos
* - Made the Integrated Video & SCSI show up even if they have id 0000
*
* Alexander Viro November 9th, 1999
* - Switched to regular procfs methods
*
* Alfred Arnold & David Weinehall August 23rd, 2000
* - Added support for Planar POS-registers
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mca.h>
#include <asm/system.h>
#include <asm/io.h>
#include <linux/proc_fs.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/ioport.h>
#include <asm/uaccess.h>
#include <linux/init.h>
#include <asm/arch_hooks.h>
static unsigned char which_scsi = 0;
int MCA_bus = 0;
EXPORT_SYMBOL(MCA_bus);
/*
* Motherboard register spinlock. Untested on SMP at the moment, but
* are there any MCA SMP boxes?
*
* Yes - Alan
*/
static DEFINE_SPINLOCK(mca_lock);
/* Build the status info for the adapter */
static void mca_configure_adapter_status(struct mca_device *mca_dev) {
mca_dev->status = MCA_ADAPTER_NONE;
mca_dev->pos_id = mca_dev->pos[0]
+ (mca_dev->pos[1] << 8);
if(!mca_dev->pos_id && mca_dev->slot < MCA_MAX_SLOT_NR) {
/* id = 0x0000 usually indicates hardware failure,
* however, ZP Gu (zpg@castle.net> reports that his 9556
* has 0x0000 as id and everything still works. There
* also seem to be an adapter with id = 0x0000; the
* NCR Parallel Bus Memory Card. Until this is confirmed,
* however, this code will stay.
*/
mca_dev->status = MCA_ADAPTER_ERROR;
return;
} else if(mca_dev->pos_id != 0xffff) {
/* 0xffff usually indicates that there's no adapter,
* however, some integrated adapters may have 0xffff as
* their id and still be valid. Examples are on-board
* VGA of the 55sx, the integrated SCSI of the 56 & 57,
* and possibly also the 95 ULTIMEDIA.
*/
mca_dev->status = MCA_ADAPTER_NORMAL;
}
if((mca_dev->pos_id == 0xffff ||
mca_dev->pos_id == 0x0000) && mca_dev->slot >= MCA_MAX_SLOT_NR) {
int j;
for(j = 2; j < 8; j++) {
if(mca_dev->pos[j] != 0xff) {
mca_dev->status = MCA_ADAPTER_NORMAL;
break;
}
}
}
if(!(mca_dev->pos[2] & MCA_ENABLED)) {
/* enabled bit is in POS 2 */
mca_dev->status = MCA_ADAPTER_DISABLED;
}
} /* mca_configure_adapter_status */
/*--------------------------------------------------------------------*/
static struct resource mca_standard_resources[] = {
{ .start = 0x60, .end = 0x60, .name = "system control port B (MCA)" },
{ .start = 0x90, .end = 0x90, .name = "arbitration (MCA)" },
{ .start = 0x91, .end = 0x91, .name = "card Select Feedback (MCA)" },
{ .start = 0x92, .end = 0x92, .name = "system Control port A (MCA)" },
{ .start = 0x94, .end = 0x94, .name = "system board setup (MCA)" },
{ .start = 0x96, .end = 0x97, .name = "POS (MCA)" },
{ .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
};
#define MCA_STANDARD_RESOURCES ARRAY_SIZE(mca_standard_resources)
/**
* mca_read_and_store_pos - read the POS registers into a memory buffer
* @pos: a char pointer to 8 bytes, contains the POS register value on
* successful return
*
* Returns 1 if a card actually exists (i.e. the pos isn't
* all 0xff) or 0 otherwise
*/
static int mca_read_and_store_pos(unsigned char *pos) {
int j;
int found = 0;
for(j=0; j<8; j++) {
if((pos[j] = inb_p(MCA_POS_REG(j))) != 0xff) {
/* 0xff all across means no device. 0x00 means
* something's broken, but a device is
* probably there. However, if you get 0x00
* from a motherboard register it won't matter
* what we find. For the record, on the
* 57SLC, the integrated SCSI adapter has
* 0xffff for the adapter ID, but nonzero for
* other registers. */
found = 1;
}
}
return found;
}
static unsigned char mca_pc_read_pos(struct mca_device *mca_dev, int reg)
{
unsigned char byte;
unsigned long flags;
if(reg < 0 || reg >= 8)
return 0;
spin_lock_irqsave(&mca_lock, flags);
if(mca_dev->pos_register) {
/* Disable adapter setup, enable motherboard setup */
outb_p(0, MCA_ADAPTER_SETUP_REG);
outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
byte = inb_p(MCA_POS_REG(reg));
outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
} else {
/* Make sure motherboard setup is off */
outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
/* Read the appropriate register */
outb_p(0x8|(mca_dev->slot & 0xf), MCA_ADAPTER_SETUP_REG);
byte = inb_p(MCA_POS_REG(reg));
outb_p(0, MCA_ADAPTER_SETUP_REG);
}
spin_unlock_irqrestore(&mca_lock, flags);
mca_dev->pos[reg] = byte;
return byte;
}
static void mca_pc_write_pos(struct mca_device *mca_dev, int reg,
unsigned char byte)
{
unsigned long flags;
if(reg < 0 || reg >= 8)
return;
spin_lock_irqsave(&mca_lock, flags);
/* Make sure motherboard setup is off */
outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
/* Read in the appropriate register */
outb_p(0x8|(mca_dev->slot&0xf), MCA_ADAPTER_SETUP_REG);
outb_p(byte, MCA_POS_REG(reg));
outb_p(0, MCA_ADAPTER_SETUP_REG);
spin_unlock_irqrestore(&mca_lock, flags);
/* Update the global register list, while we have the byte */
mca_dev->pos[reg] = byte;
}
/* for the primary MCA bus, we have identity transforms */
static int mca_dummy_transform_irq(struct mca_device * mca_dev, int irq)
{
return irq;
}
static int mca_dummy_transform_ioport(struct mca_device * mca_dev, int port)
{
return port;
}
static void *mca_dummy_transform_memory(struct mca_device * mca_dev, void *mem)
{
return mem;
}
static int __init mca_init(void)
{
unsigned int i, j;
struct mca_device *mca_dev;
unsigned char pos[8];
short mca_builtin_scsi_ports[] = {0xf7, 0xfd, 0x00};
struct mca_bus *bus;
/* WARNING: Be careful when making changes here. Putting an adapter
* and the motherboard simultaneously into setup mode may result in
* damage to chips (according to The Indispensible PC Hardware Book
* by Hans-Peter Messmer). Also, we disable system interrupts (so
* that we are not disturbed in the middle of this).
*/
/* Make sure the MCA bus is present */
if (mca_system_init()) {
printk(KERN_ERR "MCA bus system initialisation failed\n");
return -ENODEV;
}
if (!MCA_bus)
return -ENODEV;
printk(KERN_INFO "Micro Channel bus detected.\n");
/* All MCA systems have at least a primary bus */
bus = mca_attach_bus(MCA_PRIMARY_BUS);
if (!bus)
goto out_nomem;
bus->default_dma_mask = 0xffffffffLL;
bus->f.mca_write_pos = mca_pc_write_pos;
bus->f.mca_read_pos = mca_pc_read_pos;
bus->f.mca_transform_irq = mca_dummy_transform_irq;
bus->f.mca_transform_ioport = mca_dummy_transform_ioport;
bus->f.mca_transform_memory = mca_dummy_transform_memory;
/* get the motherboard device */
mca_dev = kmalloc(sizeof(struct mca_device), GFP_KERNEL);
if(unlikely(!mca_dev))
goto out_nomem;
memset(mca_dev, 0, sizeof(struct mca_device));
/*
* We do not expect many MCA interrupts during initialization,
* but let us be safe:
*/
spin_lock_irq(&mca_lock);
/* Make sure adapter setup is off */
outb_p(0, MCA_ADAPTER_SETUP_REG);
/* Read motherboard POS registers */
mca_dev->pos_register = 0x7f;
outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
mca_dev->name[0] = 0;
mca_read_and_store_pos(mca_dev->pos);
mca_configure_adapter_status(mca_dev);
/* fake POS and slot for a motherboard */
mca_dev->pos_id = MCA_MOTHERBOARD_POS;
mca_dev->slot = MCA_MOTHERBOARD;
mca_register_device(MCA_PRIMARY_BUS, mca_dev);
mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC);
if(unlikely(!mca_dev))
goto out_unlock_nomem;
memset(mca_dev, 0, sizeof(struct mca_device));
/* Put motherboard into video setup mode, read integrated video
* POS registers, and turn motherboard setup off.
*/
mca_dev->pos_register = 0xdf;
outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
mca_dev->name[0] = 0;
mca_read_and_store_pos(mca_dev->pos);
mca_configure_adapter_status(mca_dev);
/* fake POS and slot for the integrated video */
mca_dev->pos_id = MCA_INTEGVIDEO_POS;
mca_dev->slot = MCA_INTEGVIDEO;
mca_register_device(MCA_PRIMARY_BUS, mca_dev);
/* Put motherboard into scsi setup mode, read integrated scsi
* POS registers, and turn motherboard setup off.
*
* It seems there are two possible SCSI registers. Martin says that
* for the 56,57, 0xf7 is the one, but fails on the 76.
* Alfredo (apena@vnet.ibm.com) says
* 0xfd works on his machine. We'll try both of them. I figure it's
* a good bet that only one could be valid at a time. This could
* screw up though if one is used for something else on the other
* machine.
*/
for(i = 0; (which_scsi = mca_builtin_scsi_ports[i]) != 0; i++) {
outb_p(which_scsi, MCA_MOTHERBOARD_SETUP_REG);
if(mca_read_and_store_pos(pos))
break;
}
if(which_scsi) {
/* found a scsi card */
mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC);
if(unlikely(!mca_dev))
goto out_unlock_nomem;
memset(mca_dev, 0, sizeof(struct mca_device));
for(j = 0; j < 8; j++)
mca_dev->pos[j] = pos[j];
mca_configure_adapter_status(mca_dev);
/* fake POS and slot for integrated SCSI controller */
mca_dev->pos_id = MCA_INTEGSCSI_POS;
mca_dev->slot = MCA_INTEGSCSI;
mca_dev->pos_register = which_scsi;
mca_register_device(MCA_PRIMARY_BUS, mca_dev);
}
/* Turn off motherboard setup */
outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
/* Now loop over MCA slots: put each adapter into setup mode, and
* read its POS registers. Then put adapter setup off.
*/
for(i=0; i<MCA_MAX_SLOT_NR; i++) {
outb_p(0x8|(i&0xf), MCA_ADAPTER_SETUP_REG);
if(!mca_read_and_store_pos(pos))
continue;
mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC);
if(unlikely(!mca_dev))
goto out_unlock_nomem;
memset(mca_dev, 0, sizeof(struct mca_device));
for(j=0; j<8; j++)
mca_dev->pos[j]=pos[j];
mca_dev->driver_loaded = 0;
mca_dev->slot = i;
mca_dev->pos_register = 0;
mca_configure_adapter_status(mca_dev);
mca_register_device(MCA_PRIMARY_BUS, mca_dev);
}
outb_p(0, MCA_ADAPTER_SETUP_REG);
/* Enable interrupts and return memory start */
spin_unlock_irq(&mca_lock);
for (i = 0; i < MCA_STANDARD_RESOURCES; i++)
request_resource(&ioport_resource, mca_standard_resources + i);
mca_do_proc_init();
return 0;
out_unlock_nomem:
spin_unlock_irq(&mca_lock);
out_nomem:
printk(KERN_EMERG "Failed memory allocation in MCA setup!\n");
return -ENOMEM;
}
subsys_initcall(mca_init);
/*--------------------------------------------------------------------*/
static void mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
{
int slot = mca_dev->slot;
if(slot == MCA_INTEGSCSI) {
printk(KERN_CRIT "NMI: caused by MCA integrated SCSI adapter (%s)\n",
mca_dev->name);
} else if(slot == MCA_INTEGVIDEO) {
printk(KERN_CRIT "NMI: caused by MCA integrated video adapter (%s)\n",
mca_dev->name);
} else if(slot == MCA_MOTHERBOARD) {
printk(KERN_CRIT "NMI: caused by motherboard (%s)\n",
mca_dev->name);
}
/* More info available in POS 6 and 7? */
if(check_flag) {
unsigned char pos6, pos7;
pos6 = mca_device_read_pos(mca_dev, 6);
pos7 = mca_device_read_pos(mca_dev, 7);
printk(KERN_CRIT "NMI: POS 6 = 0x%x, POS 7 = 0x%x\n", pos6, pos7);
}
} /* mca_handle_nmi_slot */
/*--------------------------------------------------------------------*/
static int mca_handle_nmi_callback(struct device *dev, void *data)
{
struct mca_device *mca_dev = to_mca_device(dev);
unsigned char pos5;
pos5 = mca_device_read_pos(mca_dev, 5);
if(!(pos5 & 0x80)) {
/* Bit 7 of POS 5 is reset when this adapter has a hardware
* error. Bit 7 it reset if there's error information
* available in POS 6 and 7.
*/
mca_handle_nmi_device(mca_dev, !(pos5 & 0x40));
return 1;
}
return 0;
}
void mca_handle_nmi(void)
{
/* First try - scan the various adapters and see if a specific
* adapter was responsible for the error.
*/
bus_for_each_dev(&mca_bus_type, NULL, NULL, mca_handle_nmi_callback);
mca_nmi_hook();
} /* mca_handle_nmi */
